WattStopper BZ-50RC Power Pack, Universal w/RJ45 Connection for Occupancy Sensors, 120V to 24V - White Self-contained power supply relay system Efficient switching power supply providing optimized current output based on number of sensors LED indicates status of relay or if there is a low-voltage overcurrent Zero crossing circuitry for reliability and increased product life UL 2043 plenum rated for cost-effective installation 1/2" snap-in nipple attaches to standard electrical enclosures through 1/2" knockouts 14 AWG wires on the relay for 20A operation Easy RJ45 connection RoHS-compliant Hold ON